[S] Change in flashrom[master]: meson: Move programmer test sources into programmer definition

[Anastasia Klimchuk (Code Review)]

Attention is currently required from: Felix Singer, Thomas Heijligen, Angel Pons.

Anastasia Klimchuk has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/68162 )

Change subject: meson: Move programmer test sources into programmer definition
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Patch Set 10:

(1 comment)

File tests/meson.build:

https://review.coreboot.org/c/flashrom/+/68162/comment/43ca4663_fd76daa5 
PS10, Line 32:   p_data += {
             :     'testsrc' : p_data.get('testsrc', []),
             :   }
             :   srcs += p_data.get('testsrc')
The idea is great, thank you!

I am confused by that it seems there are two different `testsrc` pieces of data and they mean different things? The first one comes from root meson.build, but then it is transformed into new testsrc which can be [] empty array?
In other words, looks like `p_data.get('testsrc')` means different things in line 33 vs line 35?